1. Ensure that you're entering your payment details on a safe and secure site. Look for "https://" in the URL of the site that you're attempting to buy something from. If you don't see that or no indication of any website security, then it's probably a great idea not to trust those people together with your account information.
2. Do not spend too much funds on shipping. Shipping charges can definitely add up. Many sites offer free shipping, free delivery once you spend a certain amount, or have a coupon code that permits you to get free delivery. Instead of paying your hard earned cash on shipping, look for a store that ships for free.
3. Be careful in regards to the online stores that you consider buying from. If the online store is poorly designed, full of misspellings, and overall fishy, you should take your money elsewhere. These are signs that something might not be right about this store. It's preferable to be safe than sorry.
5. If you want to buy a used product online, learn more about the seller first. You should visit their profile and look for reviews written by other shoppers who bought products using this seller. Usually do not hesitate to make contact with the seller to ask a few questions concerning the product you are looking at.